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Many libsas drivers check if the parent of the device is an expander. Create a helper that the libsas drivers will use in follow up commits. Suggested-by: Damien Le Moal <dlemoal@kernel.org> Signed-off-by: Niklas Cassel <cassel@kernel.org> Link: https://lore.kernel.org/r/20250814173215.1765055-15-cassel@kernel.org Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: John Garry <john.g.garry@oracle.com> Reviewed-by: Jason Yan <yanaijie@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>